blob: 2101832446896245e54b608bb24f27d83e42a005 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Anycast support for IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
6 * David L Stevens (dlstevens@us.ibm.com)
7 *
8 * based heavily on net/ipv6/mcast.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
Randy Dunlap4fc268d2006-01-11 12:17:47 -080016#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/module.h>
18#include <linux/errno.h>
19#include <linux/types.h>
20#include <linux/random.h>
21#include <linux/string.h>
22#include <linux/socket.h>
23#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/net.h>
25#include <linux/in6.h>
26#include <linux/netdevice.h>
27#include <linux/if_arp.h>
28#include <linux/route.h>
29#include <linux/init.h>
30#include <linux/proc_fs.h>
31#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020034#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <net/sock.h>
36#include <net/snmp.h>
37
38#include <net/ipv6.h>
39#include <net/protocol.h>
40#include <net/if_inet6.h>
41#include <net/ndisc.h>
42#include <net/addrconf.h>
43#include <net/ip6_route.h>
44
45#include <net/checksum.h>
46
Eric Dumazetb71d1d42011-04-22 04:53:02 +000047static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49/* Big ac list lock for all the sockets */
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +000050static DEFINE_SPINLOCK(ipv6_sk_ac_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/*
54 * socket join an anycast group
55 */
56
Eric Dumazetb71d1d42011-04-22 04:53:02 +000057int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
59 struct ipv6_pinfo *np = inet6_sk(sk);
60 struct net_device *dev = NULL;
61 struct inet6_dev *idev;
62 struct ipv6_ac_socklist *pac;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070063 struct net *net = sock_net(sk);
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -070064 int ishost = !net->ipv6.devconf_all->forwarding;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 int err = 0;
66
Eric W. Biedermanaf31f412012-11-16 03:03:06 +000067 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 return -EPERM;
69 if (ipv6_addr_is_multicast(addr))
70 return -EINVAL;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070071 if (ipv6_chk_addr(net, addr, NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return -EINVAL;
73
74 pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);
75 if (pac == NULL)
76 return -ENOMEM;
77 pac->acl_next = NULL;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +000078 pac->acl_addr = *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Eric Dumazetbb69ae02010-06-07 11:42:13 +000080 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (ifindex == 0) {
82 struct rt6_info *rt;
83
Daniel Lezcano6ab57e72008-03-26 16:52:32 -070084 rt = rt6_lookup(net, addr, NULL, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (rt) {
David S. Millerd1918542011-12-28 20:19:20 -050086 dev = rt->dst.dev;
Amerigo Wang94e187c2012-10-29 00:13:19 +000087 ip6_rt_put(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 } else if (ishost) {
89 err = -EADDRNOTAVAIL;
Eric Dumazetbb69ae02010-06-07 11:42:13 +000090 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 } else {
92 /* router, no matching interface: just pick one */
Eric Dumazetbb69ae02010-06-07 11:42:13 +000093 dev = dev_get_by_flags_rcu(net, IFF_UP,
94 IFF_UP | IFF_LOOPBACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
96 } else
Eric Dumazetbb69ae02010-06-07 11:42:13 +000097 dev = dev_get_by_index_rcu(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 if (dev == NULL) {
100 err = -ENODEV;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000101 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 }
103
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000104 idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (!idev) {
106 if (ifindex)
107 err = -ENODEV;
108 else
109 err = -EADDRNOTAVAIL;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000110 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
112 /* reset ishost, now that we have a specific device */
113 ishost = !idev->cnf.forwarding;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 pac->acl_ifindex = dev->ifindex;
116
117 /* XXX
118 * For hosts, allow link-local or matching prefix anycasts.
119 * This obviates the need for propagating anycast routes while
120 * still allowing some non-router anycast participation.
121 */
YOSHIFUJI Hideaki52eeeb82008-03-15 22:54:23 -0400122 if (!ipv6_chk_prefix(addr, dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (ishost)
124 err = -EADDRNOTAVAIL;
125 if (err)
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000126 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
128
129 err = ipv6_dev_ac_inc(dev, addr);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000130 if (!err) {
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000131 spin_lock_bh(&ipv6_sk_ac_lock);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000132 pac->acl_next = np->ipv6_ac_list;
133 np->ipv6_ac_list = pac;
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000134 spin_unlock_bh(&ipv6_sk_ac_lock);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000135 pac = NULL;
136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000138error:
139 rcu_read_unlock();
140 if (pac)
141 sock_kfree_s(sk, pac, sizeof(*pac));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return err;
143}
144
145/*
146 * socket leave an anycast group
147 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000148int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct ipv6_pinfo *np = inet6_sk(sk);
151 struct net_device *dev;
152 struct ipv6_ac_socklist *pac, *prev_pac;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700153 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000155 spin_lock_bh(&ipv6_sk_ac_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 prev_pac = NULL;
157 for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
158 if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
159 ipv6_addr_equal(&pac->acl_addr, addr))
160 break;
161 prev_pac = pac;
162 }
163 if (!pac) {
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000164 spin_unlock_bh(&ipv6_sk_ac_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 return -ENOENT;
166 }
167 if (prev_pac)
168 prev_pac->acl_next = pac->acl_next;
169 else
170 np->ipv6_ac_list = pac->acl_next;
171
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000172 spin_unlock_bh(&ipv6_sk_ac_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000174 rcu_read_lock();
175 dev = dev_get_by_index_rcu(net, pac->acl_ifindex);
176 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 ipv6_dev_ac_dec(dev, &pac->acl_addr);
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000178 rcu_read_unlock();
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 sock_kfree_s(sk, pac, sizeof(*pac));
181 return 0;
182}
183
184void ipv6_sock_ac_close(struct sock *sk)
185{
186 struct ipv6_pinfo *np = inet6_sk(sk);
187 struct net_device *dev = NULL;
188 struct ipv6_ac_socklist *pac;
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700189 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 int prev_index;
191
Eric Dumazet0e1efe92012-12-05 09:18:10 +0000192 if (!np->ipv6_ac_list)
193 return;
194
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000195 spin_lock_bh(&ipv6_sk_ac_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 pac = np->ipv6_ac_list;
197 np->ipv6_ac_list = NULL;
YOSHIFUJI Hideaki / 吉藤英明c33e7b02013-01-30 09:27:58 +0000198 spin_unlock_bh(&ipv6_sk_ac_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 prev_index = 0;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000201 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 while (pac) {
203 struct ipv6_ac_socklist *next = pac->acl_next;
204
205 if (pac->acl_ifindex != prev_index) {
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000206 dev = dev_get_by_index_rcu(net, pac->acl_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 prev_index = pac->acl_ifindex;
208 }
209 if (dev)
210 ipv6_dev_ac_dec(dev, &pac->acl_addr);
211 sock_kfree_s(sk, pac, sizeof(*pac));
212 pac = next;
213 }
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000214 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217static void aca_put(struct ifacaddr6 *ac)
218{
219 if (atomic_dec_and_test(&ac->aca_refcnt)) {
220 in6_dev_put(ac->aca_idev);
Changli Gaod8d1f302010-06-10 23:31:35 -0700221 dst_release(&ac->aca_rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 kfree(ac);
223 }
224}
225
226/*
227 * device anycast group inc (add if not found)
228 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000229int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
231 struct ifacaddr6 *aca;
232 struct inet6_dev *idev;
233 struct rt6_info *rt;
234 int err;
235
236 idev = in6_dev_get(dev);
237
238 if (idev == NULL)
239 return -EINVAL;
240
241 write_lock_bh(&idev->lock);
242 if (idev->dead) {
243 err = -ENODEV;
244 goto out;
245 }
246
247 for (aca = idev->ac_list; aca; aca = aca->aca_next) {
248 if (ipv6_addr_equal(&aca->aca_addr, addr)) {
249 aca->aca_users++;
250 err = 0;
251 goto out;
252 }
253 }
254
255 /*
256 * not found: create a new one.
257 */
258
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800259 aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261 if (aca == NULL) {
262 err = -ENOMEM;
263 goto out;
264 }
265
David S. Miller8f031512011-12-06 16:48:14 -0500266 rt = addrconf_dst_alloc(idev, addr, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 if (IS_ERR(rt)) {
268 kfree(aca);
269 err = PTR_ERR(rt);
270 goto out;
271 }
272
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000273 aca->aca_addr = *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 aca->aca_idev = idev;
275 aca->aca_rt = rt;
276 aca->aca_users = 1;
277 /* aca_tstamp should be updated upon changes */
278 aca->aca_cstamp = aca->aca_tstamp = jiffies;
279 atomic_set(&aca->aca_refcnt, 2);
280 spin_lock_init(&aca->aca_lock);
281
282 aca->aca_next = idev->ac_list;
283 idev->ac_list = aca;
284 write_unlock_bh(&idev->lock);
285
Denis V. Lunev84f59372008-04-03 13:33:00 -0700286 ip6_ins_rt(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288 addrconf_join_solict(dev, &aca->aca_addr);
289
290 aca_put(aca);
291 return 0;
292out:
293 write_unlock_bh(&idev->lock);
294 in6_dev_put(idev);
295 return err;
296}
297
298/*
299 * device anycast group decrement
300 */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000301int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 struct ifacaddr6 *aca, *prev_aca;
304
305 write_lock_bh(&idev->lock);
306 prev_aca = NULL;
307 for (aca = idev->ac_list; aca; aca = aca->aca_next) {
308 if (ipv6_addr_equal(&aca->aca_addr, addr))
309 break;
310 prev_aca = aca;
311 }
312 if (!aca) {
313 write_unlock_bh(&idev->lock);
314 return -ENOENT;
315 }
316 if (--aca->aca_users > 0) {
317 write_unlock_bh(&idev->lock);
318 return 0;
319 }
320 if (prev_aca)
321 prev_aca->aca_next = aca->aca_next;
322 else
323 idev->ac_list = aca->aca_next;
324 write_unlock_bh(&idev->lock);
325 addrconf_leave_solict(idev, &aca->aca_addr);
326
Changli Gaod8d1f302010-06-10 23:31:35 -0700327 dst_hold(&aca->aca_rt->dst);
Denis V. Lunev84f59372008-04-03 13:33:00 -0700328 ip6_del_rt(aca->aca_rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 aca_put(aca);
331 return 0;
332}
333
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000334/* called with rcu_read_lock() */
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000335static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000337 struct inet6_dev *idev = __in6_dev_get(dev);
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 if (idev == NULL)
340 return -ENODEV;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000341 return __ipv6_dev_ac_dec(idev, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344/*
345 * check if the interface has this anycast address
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000346 * called with rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000348static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
350 struct inet6_dev *idev;
351 struct ifacaddr6 *aca;
352
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000353 idev = __in6_dev_get(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (idev) {
355 read_lock_bh(&idev->lock);
356 for (aca = idev->ac_list; aca; aca = aca->aca_next)
357 if (ipv6_addr_equal(&aca->aca_addr, addr))
358 break;
359 read_unlock_bh(&idev->lock);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700360 return aca != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
Eric Dumazeta50feda2012-05-18 18:57:34 +0000362 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
365/*
366 * check if given interface (or any, if dev==0) has this anycast address
367 */
Eric Dumazeta50feda2012-05-18 18:57:34 +0000368bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
369 const struct in6_addr *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370{
Eric Dumazeta50feda2012-05-18 18:57:34 +0000371 bool found = false;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700372
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800373 rcu_read_lock();
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000374 if (dev)
375 found = ipv6_chk_acast_dev(dev, addr);
376 else
377 for_each_netdev_rcu(net, dev)
378 if (ipv6_chk_acast_dev(dev, addr)) {
Eric Dumazeta50feda2012-05-18 18:57:34 +0000379 found = true;
Eric Dumazetbb69ae02010-06-07 11:42:13 +0000380 break;
381 }
Eric Dumazetc6d14c82009-11-04 05:43:23 -0800382 rcu_read_unlock();
Pavel Emelianov7562f872007-05-03 15:13:45 -0700383 return found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384}
385
FX Le Bail7c90cc22014-01-22 07:42:37 +0100386/* check if this anycast address is link-local on given interface or
387 * is global
388 */
389bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
390 const struct in6_addr *addr)
391{
392 return ipv6_chk_acast_addr(net,
393 (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ?
394 dev : NULL),
395 addr);
396}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398#ifdef CONFIG_PROC_FS
399struct ac6_iter_state {
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700400 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 struct net_device *dev;
402 struct inet6_dev *idev;
403};
404
405#define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private)
406
407static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq)
408{
409 struct ifacaddr6 *im = NULL;
410 struct ac6_iter_state *state = ac6_seq_private(seq);
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700411 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Pavel Emelianov7562f872007-05-03 15:13:45 -0700413 state->idev = NULL;
Eric Dumazetce81b762009-11-11 17:34:30 +0000414 for_each_netdev_rcu(net, state->dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 struct inet6_dev *idev;
Eric Dumazetce81b762009-11-11 17:34:30 +0000416 idev = __in6_dev_get(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 if (!idev)
418 continue;
419 read_lock_bh(&idev->lock);
420 im = idev->ac_list;
421 if (im) {
422 state->idev = idev;
423 break;
424 }
425 read_unlock_bh(&idev->lock);
426 }
427 return im;
428}
429
430static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)
431{
432 struct ac6_iter_state *state = ac6_seq_private(seq);
433
434 im = im->aca_next;
435 while (!im) {
Eric Dumazetce81b762009-11-11 17:34:30 +0000436 if (likely(state->idev != NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 read_unlock_bh(&state->idev->lock);
Eric Dumazetce81b762009-11-11 17:34:30 +0000438
439 state->dev = next_net_device_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 if (!state->dev) {
441 state->idev = NULL;
442 break;
443 }
Eric Dumazetce81b762009-11-11 17:34:30 +0000444 state->idev = __in6_dev_get(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 if (!state->idev)
446 continue;
447 read_lock_bh(&state->idev->lock);
448 im = state->idev->ac_list;
449 }
450 return im;
451}
452
453static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos)
454{
455 struct ifacaddr6 *im = ac6_get_first(seq);
456 if (im)
457 while (pos && (im = ac6_get_next(seq, im)) != NULL)
458 --pos;
459 return pos ? NULL : im;
460}
461
462static void *ac6_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazetce81b762009-11-11 17:34:30 +0000463 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Eric Dumazetce81b762009-11-11 17:34:30 +0000465 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return ac6_get_idx(seq, *pos);
467}
468
469static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
470{
Eric Dumazetce81b762009-11-11 17:34:30 +0000471 struct ifacaddr6 *im = ac6_get_next(seq, v);
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 ++*pos;
474 return im;
475}
476
477static void ac6_seq_stop(struct seq_file *seq, void *v)
Eric Dumazetce81b762009-11-11 17:34:30 +0000478 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 struct ac6_iter_state *state = ac6_seq_private(seq);
Eric Dumazetce81b762009-11-11 17:34:30 +0000481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (likely(state->idev != NULL)) {
483 read_unlock_bh(&state->idev->lock);
Eric Dumazetce81b762009-11-11 17:34:30 +0000484 state->idev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 }
Eric Dumazetce81b762009-11-11 17:34:30 +0000486 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
489static int ac6_seq_show(struct seq_file *seq, void *v)
490{
491 struct ifacaddr6 *im = (struct ifacaddr6 *)v;
492 struct ac6_iter_state *state = ac6_seq_private(seq);
493
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700494 seq_printf(seq, "%-4d %-15s %pi6 %5d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 state->dev->ifindex, state->dev->name,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700496 &im->aca_addr, im->aca_users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return 0;
498}
499
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700500static const struct seq_operations ac6_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 .start = ac6_seq_start,
502 .next = ac6_seq_next,
503 .stop = ac6_seq_stop,
504 .show = ac6_seq_show,
505};
506
507static int ac6_seq_open(struct inode *inode, struct file *file)
508{
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700509 return seq_open_net(inode, file, &ac6_seq_ops,
510 sizeof(struct ac6_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
Arjan van de Ven9a321442007-02-12 00:55:35 -0800513static const struct file_operations ac6_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 .owner = THIS_MODULE,
515 .open = ac6_seq_open,
516 .read = seq_read,
517 .llseek = seq_lseek,
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700518 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519};
520
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000521int __net_init ac6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
Gao fengd4beaa62013-02-18 01:34:54 +0000523 if (!proc_create("anycast6", S_IRUGO, net->proc_net, &ac6_seq_fops))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return -ENOMEM;
525
526 return 0;
527}
528
Daniel Lezcano6ab57e72008-03-26 16:52:32 -0700529void ac6_proc_exit(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
Gao fengece31ff2013-02-18 01:34:56 +0000531 remove_proc_entry("anycast6", net->proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
533#endif
534